package com.blue.common.utils;

import com.blue.common.entity.Column;
import com.blue.common.entity.GenerateSet;
import com.blue.common.entity.Table;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 代码生成器   工具类
 *
 * @author chenshun
 * @email sunlightcs@gmail.com
 * @date 2016年12月19日 下午11:40:24
 */
public class GenUtils {

    public static List<String> getTemplates() {
        List<String> templates = new ArrayList<String>();
        templates.add("template/EntityPO.java.vm");
        templates.add("template/EntityDTO.java.vm");
        templates.add("template/EntityVO.java.vm");
        templates.add("template/Mapper.xml.vm");
        templates.add("template/Service.java.vm");
        templates.add("template/ServiceImpl.java.vm");
        templates.add("template/Controller.java.vm");
        templates.add("template/Mapper.java.vm");
        templates.add("template/index.vue.vm");
        templates.add("template/addOrEdit.vue.vm");
        return templates;
    }

    /**
     * 生成代码
     */
    public static void generatorCode(Map<String, String> table,
                                     List<Map<String, String>> columns, ZipOutputStream zip, GenerateSet set) {
        //配置信息
        Configuration config = getConfig();
        boolean hasBigDecimal = false;
        boolean hasList = false;
        //表信息
        Table tableEntity = new Table();
        tableEntity.setTableName(table.get("tableName"));
        tableEntity.setComments(table.get("tableComment"));
        //表名转换成Java类名
        String className = tableToJava(tableEntity.getTableName(), set.getTablePrefix().split(","));
        tableEntity.setClassName(className);
        tableEntity.setClassname(StringUtils.uncapitalize(className));

        //列信息
        List<Column> columsList = new ArrayList<>();
        for (Map<String, String> column : columns) {
            Column columnEntity = new Column();
            columnEntity.setColumnName(column.get("columnName"));
            columnEntity.setDataType(column.get("dataType"));
            columnEntity.setComments(column.get("columnComment"));
            columnEntity.setExtra(column.get("extra"));

            //列名转换成Java属性名
            String attrName = columnToJava(columnEntity.getColumnName());
            columnEntity.setAttrName(attrName);
            columnEntity.setAttrname(StringUtils.uncapitalize(attrName));

            //列的数据类型，转换成Java类型
            String attrType = config.getString(columnEntity.getDataType(), columnToJava(columnEntity.getDataType()));
            columnEntity.setAttrType(attrType);


            if (!hasBigDecimal && attrType.equals("BigDecimal")) {
                hasBigDecimal = true;
            }
            if (!hasList && "array".equals(columnEntity.getExtra())) {
                hasList = true;
            }
            //是否主键
            if ("PRI".equalsIgnoreCase(column.get("columnKey")) && tableEntity.getPk() == null) {
                tableEntity.setPk(columnEntity);
            }

            columsList.add(columnEntity);
        }
        tableEntity.setColumns(columsList);

        //没主键，则第一个字段为主键
        if (tableEntity.getPk() == null) {
            tableEntity.setPk(tableEntity.getColumns().get(0));
        }

        //设置velocity资源加载器
        Properties prop = new Properties();
        prop.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
        Velocity.init(prop);
        //封装模板数据
        Map<String, Object> map = new HashMap<>();
        map.put("tableName", tableEntity.getTableName());
        map.put("comments", tableEntity.getComments());
        map.put("pk", tableEntity.getPk());
        map.put("className", tableEntity.getClassName());
        map.put("classname", tableEntity.getClassname());
        map.put("pathName", tableEntity.getClassname());
        map.put("columns", tableEntity.getColumns());
        map.put("hasBigDecimal", hasBigDecimal);
        map.put("hasList", hasList);
        map.put("package", set.getPackageName());
        map.put("moduleName", set.getModuleName());
        map.put("author", set.getAuthor());
        map.put("email", set.getEmail());
        map.put("datetime", new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
        VelocityContext context = new VelocityContext(map);

        //获取模板列表
        List<String> templates = getTemplates();
        for (String template : templates) {
            //渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, "UTF-8");
            tpl.merge(context, sw);

            try {
                //添加到zip
                zip.putNextEntry(new ZipEntry(Objects.requireNonNull(getFileName(template, tableEntity.getClassName(), set.getModuleName()))));
                IOUtils.write(sw.toString(), zip, "UTF-8");
                IOUtils.closeQuietly(sw);
                zip.closeEntry();
            } catch (IOException e) {
                throw new RuntimeException("渲染模板失败，表名：" + tableEntity.getTableName(), e);
            }
        }
    }


    /**
     * 列名转换成Java属性名
     */
    public static String columnToJava(String columnName) {
        return WordUtils.capitalizeFully(columnName, new char[]{'_'}).replace("_", "");
    }

    /**
     * 表名转换成Java类名
     */
    public static String tableToJava(String tableName, String[] tablePrefixArray) {
        if (tablePrefixArray != null) {
            for (String tablePrefix : tablePrefixArray) {
                if (tableName.startsWith(tablePrefix)) {
                    tableName = tableName.replaceFirst(tablePrefix, "");
                }
            }
        }
        return columnToJava(tableName);
    }

    /**
     * 获取配置信息
     */
    public static Configuration getConfig() {
        try {
            return new PropertiesConfiguration("generator.properties");
        } catch (ConfigurationException e) {
            throw new RuntimeException("获取配置文件失败，", e);
        }
    }

    /**
     * 获取文件名
     */
    public static String getFileName(String template, String className, String moduleName) {
        String packagePath = "blue" + File.separator + "java" + File.separator;
        if (template.contains("EntityPO.java.vm")) {
            return packagePath + "entity" + File.separator + "po" + File.separator + className + "PO.java";
        }
        if (template.contains("EntityDTO.java.vm")) {
            return packagePath + "entity" + File.separator + "dto" + File.separator + className + "DTO.java";
        }
        if (template.contains("EntityVO.java.vm")) {
            return packagePath + "entity" + File.separator + "vo" + File.separator + className + "VO.java";
        }
        if (template.contains("Mapper.java.vm")) {
            return packagePath + "mapper" + File.separator + className + "Mapper.java";
        }
        if (template.contains("Service.java.vm")) {
            return packagePath + "service" + File.separator + "I" + className + "Service.java";
        }
        if (template.contains("ServiceImpl.java.vm")) {
            return packagePath + "service" + File.separator + "impl" + File.separator + className + "ServiceImpl.java";
        }
        if (template.contains("Controller.java.vm")) {
            return packagePath + "controller" + File.separator + className + "Controller.java";
        }
        if (template.contains("Mapper.xml.vm")) {
            return "blue" + File.separator + "resources" + File.separator + "mapper" + File.separator + className + "Mapper.xml";
        }
        if (template.contains("index.vue.vm")) {
            return "blue" + File.separator + "resources" + File.separator + "src" + File.separator + "views" +
                    File.separator + moduleName + File.separator + className.toLowerCase() + File.separator + "index.vue";
        }
        if (template.contains("addOrEdit.vue.vm")) {
            return "blue" + File.separator + "resources" + File.separator + "src" + File.separator + "views" +
                    File.separator + moduleName + File.separator + className.toLowerCase() + File.separator + "addOrEdit.vue";
        }
        return null;
    }
}
